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4 years ago

if (-4,5) is the only solution to a system of two linear equations, then the graphical solution would show:

1 answer:

7 0

What shape do <em>linear <u /></em><u />equations make? To picture the solution visually, you can imagine two of those shapes meeting on a graph at one (and only one) point, (-4,5).

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Tasha purchased a $40 shirt on sale for $30 how much of a discount did Tasha recieve

WITCHER [35]

She received $10 discount

6 0

3 years ago

Read 2 more answers

Use the function f(x) = 2 - 5x to fill in the blanks in the table. x f(x)

kvasek [131]

I will one only and you do the rest.

Let x = -2

Plug into given function.

f(-2) = 2 - 5(-2)

f(-2) = 2 + 10

f(-2) = 12

So, when x = -2, f(x) = 12.

Table:

x............ f(x)
-2 12
-1
0
1
2

Find the rest the same way.

5 0

3 years ago

Rebecca answered 42 of 60 questions correctly on a test which method should he she used to find the percent of question she answ

MakcuM [25]

She answered 70% questions correctly

Further explanation:

Percetages are used to calculae the success or failure in tests or exams usually.

Given

$Total\ questions= 60\\The\ questions\ attempted\ correctly=42$

The percentage will be calculated as follows:

$Percentage\ of\ correctly\ answered\ questions=\frac{Correct\ questions}{Total\ questions}*100\\= \frac{42}{60}*100\\=70\%$

She answered 70% questions correctly

Keywords: Percentage, Success rate

Learn more about percentage at:

#LearnwithBrainly

3 0

3 years ago

Read 2 more answers

Could someone help me please???

mylen [45]

3 hours worked - $19.50

0.5 hours - x

x= 0.5(19.5)/3

x=3.25

and then do the same for the other cases

6 0

4 years ago

Read 2 more answers

a previous analysis of paper boxes showed that the standard deviation of the length is 9mm. What is the 98% confidence interval

il63 [147K]

We cannot calculate the confidence interval without the sample size. However, for the second question, the sample size needed would be 49.

The formula we use is

$n=(\frac{z_{\frac{\alpha}{2}}\times \sigma}{E})^2$

To find the z-score:
Convert 98% to a decimal: 0.98
Subtract from 1: 1-0.98 = 0.02
Divide by 2: 0.02/2 = 0.01
Subtract from 1: 1-0.01 = 0.99

Using a z-table (http://www.z-table.com) we see that this value is closest to a z-score of 2.33.

Using the z-score, our standard deviation (9) and our margin of error (3), we have:
$n=(\frac{2.33(9)}{3})^2=(6.99)^2=48.86\approx 49$

6 0

3 years ago